EYECARE: Coronavirus BRIEFING: Crisis Response Tactics Some Vaccine Side Effects May Mean Previous Infection By Staff Monday, May 3, 2021 10:12 AM People who experience particular side effects after receiving a COVID-19 vaccine, such as swollen lymph nodes, may have previously been infected with the coronavirus, according to a new study published on the medRxiv preprint server. The study hasn’t yet been peer-reviewed.Common side effects such as fever, fatigue, muscle pain and joint pain were also more common among those who had previous infections.An earlier COVID-19 infection, but not what’s known as “long-haul COVID-19”’ was associated with increased risk of swollen lymph nodes after receiving the vaccination, the study authors wrote.Head over to WebMD to read the full story.